Duramax Lifetime Supporter
Join Date: Oct 2016
Location: Maurice, LA
This may explain it. The Add A Fuse has two slots, a bottom one and a top one when it is plugged in.
Is your Fass fuse (the 3 amp one) in the top or the bottom slot? It should be in the top. The instructions I got from FASS when I installed mine were backwards. I even contacted FASS and they gave me the wrong information.
Again, the FASS 3 amp fuse belongs on the top.
Im also not sure I understand how you have the plumbing. In order to return the recirculated fuel from the FASS to the tank it is coming from you would need three lines coming from and to each tank:
1. Fuel supply
3. Fuel return from Fass (this is done in the filler neck in the FASS instructions)
Do you have all these lines in each tank?
Would it not be easier, now that your main fuel tank gauge is working to simply plumb the Aux tanks into the main tank and transfer the fuel as needed, simplifying the plumbing significantly?
2008 Silverado 2500HD CCSB LTZ Diesel
FASS 95 Lift Pump (with Baldwin filters), Edge Insight CTS Monitor on a Windshield Mount, Nicktane Fuel Filter Adapter w/ CAT 306-9199 UHE tertiary fuel filter, Bilstein 5100 Stock Height, MBRP Downpipe back 4" exhaust with muffler and FTE 30" resonator/muffler, Sinister EGR Delete, Tuned but wont say who did it, Bushwacker Bed Rail Caps, AMP Research Bedstep, Fumoto oil drain valve, Dorman PS Oil cooler, Pioneer AVIC 7200NEX GPS/Stereo, Air Lift LoadLifter 5000 Air Bags.
Last edited by 407driver; 06-03-2019 at 02:20 AM.